Abstract for Literature review based on Dentists’ Knowledge of Ionising Radiation dental radiography.

Abstract for literature review Despite there is a rapid growth in the technology that has myriad benefits in improving the interventions of dental health, only a fewer dentists are well aware of the risk hazards of some these modern technologies (Praveen, et.al. 2013). Large body of evidence suggests the lack of knowledge in dentists in regards to the risks associated with ionising radiation while giving dental service (Rout and Brown, 2012). More importantly, only a handful of studies have attempted to unveil the facts and current state of knowledge and awareness associated with detrimental effects of ionising radiation in Australian and Jordanian dentists. This study, through questionnaires and interviews, examined the dentists that are giving services in Australia and Jordan and assessed their knowledge of such effects that are linked with ionising radiations. The study was carried through intense literature review was carried out to collect the current background in the subject area and the findings of these s tudies were critically reviewed. Focus of the literature review was based upon the different factors, such as the complications of ionising radiation, complications in different age group people, preventive measures and the current state of knowledge in the dentists all around the globe. Praveen, et.al (2013) suggests that radiation in dentistry is mainly used for diagnostic purposes and in a dental set-up usually the practicing dentist exposes, processes and interprets the radiograph. Although the exposure to such radiation is kept as very less, it is essential to reduce the exposure to the minimum to the dental personnel and patients in order avoid the carcinogenic and organ damaging effects that can be produced by it.. Several radiation protection measures have been advocated to ameliorate these effects. Dose dependent radiation exposure was identified as a one of the key measures in limiting the use of ionising radiation. As suggested by White and Mallya (2012), wise selection of patients to treat with ionising radiation and implement patient-specific reason, which ensures greater benefits than the harms are the two easiest ways to tackle with the risks associated with ionising radiation. However, Ayatollahi et.al (2012) suggests that this practice is not adequately implemented in majority of the dental clinics. Secondly, the review identified children as most susceptible to radiation exposure. Preventive measures such as use of special radiation protection equipments and dose dependent exposure were suggested to be central in minimising the effects of ionising radiation in children in dental clinics. Moreover, it was suggested that knowledge of such risks in dentists can make a significant contribution in the improvement of safe dental practice, ensuring adequate safeguards of both patients and dentists. The literature came up with a conclusion that up to date and evidenced based knowledge is still lacking in dentist regarding the risks of radiation hazard. This will need re-educating and re-training the dentists, make them aware of ionising radiation risks, and make them able to answer any queries from patients about the risks of ionising radiations (Praveen, et.al. 2013). As part of the clinical practice, all dentists are required to undertake radiography as part of the clinical practice in which dentists and members of the dental team, must understand the basic principles of radiation physics, hazards and protection, and should be able to undertake dental radiography safely with the production of high quality, diagnostic images (Rout and Brown, 2012). Although the grey area that was identified was that, dentists are poorly informed on how to use medical imaging tools safely and efficiently. Furthermore, they are found to underestimate the radiation risk and their devastating effec ts in patients’ long term health. In addition, some of the studies revealed that despite some knowledge on the harmful effects of ionising radiation in patients, as well as in their own health, the knowledge of patient’s protection including the exposure distance and prevention of radiation leakage, protection of personnel, i.e. the occupational risk hazards of ionising radiation, dentists were reluctant to employ these safety measures in day to day practice (Rout and Brown, 2012)). Considering the context of this study, no research has evaluated Australian and Jordanian dentists’ knowledge on the risks associated with ionising radiation in the dental clinics; suggesting the importance and need to carry out this study. This puts patients of different age groups in significant risk of developing pathological conditions that are induced by the exposure to ionising radiation. Thus, designing a training module to teach dentists about radiation safety and risk is mandatory for safe dental health practice. This study provides insights into developing new strategies, policies and practices to minimise or even avoid such risks in the future. References Gray, C.F. 2010, â€Å"Practice-based cone-beam computed tomography: a review†, Primary dental care : journal of the Faculty of General Dental Practitioners (UK), vol. 17, no. 4, pp. 161-167. Lalla, R.V., Saunders, D.P. & Peterson, D.E. 2014, â€Å"Chemotherapy or radiation-induced oral mucositis†, Dental clinics of North America, vol. 58, no. 2, pp. 341-349. Metsala, E., Henner, A. & Ekholm, M. 2013, â€Å"Quality assurance in digital dental imaging: a systematic review†, Acta Odontologica Scandinavica, . Praveen, B.N., Shubhasini, A.R., Bhanushree, R., Sumsum, P.S. & Sushma, C.N. 2013, â€Å"Radiation in dental practice: awareness, protection and recommendations†, The journal of contemporary dental practice, vol. 14, no. 1, pp. 143-148. Rout, J. & Brown, J. 2012, â€Å"Ionizing radiation regulations and the dental practitioner: 1. The nature of ionizing radiation and its use in dentistry†, Dental update, vol. 39, no. 3, pp. 191-2, 195-8, 201-3. Verma, S.K., Maheshwari, S., Singh, R.K. & Chaudhari, P.K. 2012, â€Å"Laser in dentistry: An innovative tool in modern dental practice†, National journal of maxillofacial surgery, vol. 3, no. 2, pp. 124-132. White, S.C. & Mallya, S.M. 2012, â€Å"Update on the biological effects of ionizing radiation, relative dose factors and radiation hygiene†, Australian Dental Journal, vol. 57 Suppl 1, pp. 2-8.

Larry Ellison Essay

Lawrence Joseph â€Å"Larryâ€Å" Ellison is a co-finder of Oracle Corporation. It’s one of the world’s leading enterprise software company. As of 2012 he is considered one of the wealthiest men alive, with a net worth of $41 Billion. His Early Years Larry Ellison was born in Manhattan, New York City. His mother, Florence Spellman, was an un-married 19-year-old of Jewish women, and his father was an Italian American U.S. Air Force pilot. After Larry Ellison was born he was very sick with pneumonia at the nine months, his mother realized that she was unable to care for him anymore, and arranged for him to be adopted by her aunt and uncle in Chicago. Lillian Spellman Ellison and Louis Ellison adopted him when he was nine months old. Lillian was the second wife of Louis Ellison, an immigrant. Larry Ellison did not meet his biological mother again until he was 48. Ellison grew up in a two-bedroom apartment in Chicago’s South Shore middle-class Jewish neighborhood. Louis, his adoptive father, was an government employee who had made a small fortune in Chicago real estate, he lost it during the Great Depression. Larry was a very intelligent young man, he unfortunately had to leave because his adopted mother (his aunt) passed away . After her passing Ellison went to Northern California to attend University of Chicago. In 1964, he moved to Northern California permanently. His Career During the 1970s, Ellison worked for Ampex Corporation. Ellison was inspired by the paper written by Edgar F. Codd on database systems called â€Å"A Relational Model of Data for Large Shared Data Banks†. In 1977, he founded Software Development Laboratories. In 1979, the company was renamed Relational Software Inc. later it was named Oracle. In 1994, Informix took over Sybase and became Oracle’s most important rival. In April 1997, Informix announced a major decrease in their earnings; Phil White soon landed in jail, and Informix was again taken over by IBM in 2001. Also in 1997, Ellison was made a director of Apple Computer after Steve Jobs came back to the company. Ellison resigned in 2002. In April 2009, Oracle announced its intent to buy Sun Microsystems. On August 9, 2010, Ellison let Hewlett-Packard’s board go for firing CEO Mark Hurd .Ellison and Hurd are close personal friends. On September 6, Oracle hired Mark Hurd and made him Co-President. Ellison refused to take the CEO position. Ellison owns stakes in Salesforce.com, NetSuite, Quark Biotechnology Inc. and Astex Pharmaceuticals. On June 20, 2012 it was reported that Ellison had agreed to buy the 98 percent of the Hawaiian island of Lana’i. The price was reported to be between $500 million and $600 million

Railway Work Shop

INDEX 1. Acknowledgement 2. Introduction 3. Layout of Railway Workshop 4. Salient Features of Jodhpur Railway Workshop 5. B. T. C. 6. Shop Organization 7. Machine Shop 8. Mill Wright Shop 9. Black Smith & Heat Treatment Shop 10. Roller Bearing 11. Corrosion Shop 12. Brake Gearing Shop 13. Lifting Shop 14. Project ACKNOWLEDGEMENT To make any endeavor successful, especially where the cooperation so many is needed, a lot of help is needed from those who are in a position to help.In the Engineering field only theoretical knowledge cannot satisfy an Engineer’s need and only on the basis an Engineer cannot do field work efficiently therefore it is very important for an Engineering student to opt some training. To get this knowledge every student of engineer college takes training according to his own branch in a well established factory or an organization in which work is being done practical and how practical work is managed in normal working condition. I am grateful to MR. RAJAT B HAGWAT, the Training and placement officer, M. B. M. Engineering College, Jodhpur for giving me the permission fro training.I would like to take this opportunity to thank all those who made my training at NORTH WESTERN RAILWAY WORKSHOP, (JODHPUR) not only possible, but also a learning experience. My sincere thanks to the Sh. Mr. B. C. Soni (B. T. C. Chief Instructor), Mr. M. S. Solanki (Sr. Instructor), Mr. R. K. Jain (Sr. Instructor), Mr. A. K. Gautam (Sr. Instructor), Mr. Rajesh Purohit (Sr. Instructor), Mr. Premdas Vaishnav (Sec. Engineer), Mr. Rajendra (Ju. Engineer), Mr. L. P. Verma (Sr. Sec. Engineer), Mr. Rajendra Sisodia (Store Clerk), Smt. Urmila Solanki (Office Clerk) I also express my sincere thanks to the incharge of B.T. C. for their regular Guidance and their helpful nature without which I cannot complete my training. I am also thankful to all the incharge of Jodhpur Railway Workshop and their sub ordinates and workers, which helped us a lot and shown the interest in u s, it gives me a great pleasure in presenting my training report on Jodhpur Railway Workshop. Sumita Hemrom B. E. II Year Student Mechanical Engineering M. B. M. Engg. College, Jodhpur ADMINISTRATIVE HIERACHYJodhpur workshop is handled by Chief Workshop Manager. He is assisted by a team of officers with the sectional staff as under: C. W. M. Sh. S. D. Meena Dy. C. M. E. Sh. D. S. Bhati W. M. Sh. J. P. Sharma W. E. E. Sh. R. S. Choudhary S. P. O Sh. N. S. Chawada S. A. F. A. Sh. K. C. Ramdeo X. En. Sh. D. R. Choudhary A. W. M. Sh. R. A. Yadav W. A. E. E. Sh. L. D. Gautam A. F. A. Sh. S. S. Ram INTRODUCTION Workshop is located near main Railway station of Jodhpur. This workshop is well established and running successfully as a complete organization.In 1969, to increase administrative efficiency, the post of â€Å"Works Manager† was upgraded to Deputy Chief Mechanical Engineer. Now a days, this workshop has not only stopped importing valuable and costly components but also st arted the production of some essential and sophisticate components. Along with this, the basic role of Jodhpur workshop is: – 1. Periodic over hauling of the Railway coach and bogies at the level. 2. Manufacture and repairing of components used in Diesel engine for Diesel shed. 3. Maintenance and repairing of all the machines, which are installed in Jodhpur Railway station. 4.Now a days, it is also engaged in production of some components, which needs to be replaced in Railway coaches and bogies. There are 16 regional head quarters in India which are as follows:- 1. Western Railway – Mumbai 2. Central Railway – Mumbai 3. Northern Railway – New Delhi 4. Southern Railway – Chennai 5. Eastern Railway – Chennai 6. South Eastern Railway – Calcutta 7. North Eastern Railway – Gorakhpur 8. South Central Railway – Secundarabad 9. North East Frontier Railway – Guwahati 10. East Central Railway – Hazipur 11. North Cen tral Railway – Allahabad 12. North Western Railway – Jaipur 13. West Central Railway – Jabalpur 4. South Western Railway – Hubli 15. South East Central Railway – Bilaspur 16. East Coast Railway – Bhuvaneshwer SALIENT FEATURES OF JODHPUR RAILWAY WORKSHOP | 1. |Total Area | 115339 sq. m. | | 2. |Covered Area (Shed + Buildings) | 48983 sq. m. | | 3. |Track length | 8820. 9 m. | | 4. |Road Length | 1564 m. | | 5. Electric Consumption | 2. 2 lac units/month | | 6. |No. Of Machines | 446 | | 7. |Standby Generation Capacity | 796 KW | | 8. |Power Demand | 1240 KVA | | 9. |Power Factor | 0. 85 | | 10. Water Storage: Underground | 3337 lit. | | |Overhead |225 lit. | | 11. | Pneumatic Power By | 10 Compressors | POWER SUPPLY The electricity is supplied by JVVNL and is also generated by generator sets in case of supply failure. The requirement of electricity in workshop is as follows:- | 1. |Connected Load | 4600 KVA | | 2. Demand | 1360 KVA | | 3. |Maximum Demand | 1400 KVA | | 4. |Actual Utilization: Day Shift | 110-1250 KVA | | |Night Shift |400-500 KVA | | 5. |Average Consumption per day | 9000 Units | | 6. Lighting Consumption Per Month | 15000 Units | Today the staff strength stands at 2400 employees including 150 supervisors and 6 administrative officers. In 1992 it achieved the ISO 9001 certificate. Shop Organization [pic] BLACK SMITH AND HEAT TREATMENT INTRODUCTION Smithing is understood to handle relative small jobs only such as can be heated in an open fire or hearth. The shop in which the work is carried out is known as smithy’s or smithy shop and various operation are performed by means of hand hammer or small power hammers.Forging refers to production of those parts which must be heated in a close furnace. The portion of work in which forging is done is termed as the forge and work is mainly performed by means of heavy hammers, forging machines and presses. Shaping of metal is done either by steady comp ression or by impact between hammer and anvil after heating it above recrystallisation temperature in forging. Forging can be defined as the controlled plastic deformation of metal at elevated temperature in to a predetermined sizes and shapes using compressive forces exerted through some type of die by a hammer, a press or an upsetting machine.The B. S. H. T. shop is divided as:- 1. Draw gear section 2. Buffer section 3. Spring section INSTALLATIONS 1. Pneumatic power hammers (5 nos. ) 250 kg. Capacity-2nos. 500 kg. Capacity-1nos. 1000 kg. Capacity-2nos. 2. Hydraulic presses (3 nos) 3. Combined shearing, punching and nibbing machine (1 nos) 4. Spring testing machine (2 nos. ) 5. Air blowers (2 nos. ) 50 h. p. 6. Grinder (1 nos. ) 7. Circular saw (1 nos) 8. Power hacksaw (1 nos ) 9. Furnace (6 nos) 10. Shot peening machine (1 nos) 11. Tension (proof load ) testing machine (1 nos) PNEUMATIC POWER HAMMER:-The hammer has two cylinders compressor cylinder & ram cylinder. Piston of compr essor cylinder compresses air and delivers it to the ram cylinder where it accelerate the piston, which is integral with ram delivering the blows to the work. The reciprocation of the compression piston is obtained from a crank drive which is powered from a motor through reducing gear. The air distributor device between the two cylinders consist of rotary valves with parts through which air passes into the ram cylinder, blows & above the piston, alternatively. This drives the ram up & down respectively. HYDRAULIC POWER PRESS:-In power press the ram is driven by power instead of hand as in the case of hand press , The principal of a typical forging press is as follows:- The fluid passes first from a large capacity tank to a pump and then is delivered on the press with the aid of an accumulator and distributor at a pressure of at a pressure of at 200 to 300 kg/cm. The accumulator fluid pressure flows into to main cylinder and pressure on the top of the large piston. Since the cross-se ction area of the piston in the main cylinder is large, the press ram is forced down upon the material to be forged which lies on the anvil with high total power.Each power stroke the large piston is returned into its initial position by action of the working fluid on the piston rod in the pull back cylinder. To perform this motion, a relatively lower fluid pressure, but a large volume of water per unit time is required to accelerate the return stroke. FURNACES: The job is heated to correct forging temperature in a hearth or furnaces. The gas and oil are economical, easily controlled and most widely used fuels. In workshop, we used coal and crude oil as fuel forge furnaces are built so as to ensure a temperature up to 1350 degree centigrade in their working chamber.Two types of furnaces are used in this shop:- 1. Coke fired furnaces 2. Coal fired furnaces In cock furnace coke is used as fuel. In oil fired furnaces diesel is used as fuel. Diesel is sent by cast iron pipes from diesel tank in an injector and compressed air is sent on high intensity by a blower. The air jet mixed with diesel is used as fuel in oil fired furnace. Furnace are used to red hot the raw material to the required temperature. Fuel is injected into these furnace with a great pressure associated with air blast. This high pressure is generated by centrifugal air compressor, which is situated in the shop itself.This compressed air from the compressor is then taken to several furnaces through the underground pipes. One man is present near the furnace that puts the raw material and takes out the red-hot material, which is then placed under power hammer. After acquiring the required shape, these products are either hardened by various hardening procedures or simply cooled to the atmospheric temperature. Draw Gear Section:- The draw gear and screw coupling are used to connect two coaches to each other. These are designed for a proof load of 75tones and breaking load of 130t.The components are sp ecially heat treated to achieve the load bearing capacity. In maintenance procedure of draw gear and screw coupling stress relieving is done. The components made of st 60-61 are to be stress relived and the new material introduced for draw gear IS: 5517-93 Grade35Mn6M03 is not to be heat treated. The maximum temperature up to which draw gear can be heated is 550 C. Buffer Section:- Buffers are used to absorb the shock during impact action of coaches. Apart from absorb the impact energy it also guide the coaches to align in track during turn on curvature.Each buffer has capacity of 1030 kg-m with a total stroke of 127 mm. Rubber springs are used in this buffer assembly so it have low absorption capacity in earlier part of the stroke which rises rapidly towards the end resulting in absorption of high shock loads and transmitting of minimum end pressure to under frame. Components of buffer assembly: ? Buffer casing (cast steel) ? Buffer plunger (cast steel, forged) ? Rubber buffer pads ? Buffer spindle ? Destruction tube ? Recoil spring ? Recoil spring parting plate ? Buffing spring parting plate ? Recoil spring washer ? Face plate for buffer plunger M-24 Hex head bolt Spring Section:- The springs are used in the bogie for the suspension system of coaches. There are two types of suspension as primary and secondary suspension. The springs classified to primary and secondary system by the load carried by them. Fig: Inspection procedure:- Inspect all components visually for dimensional distortion and surface defects such as cracks, wear, dent marks and pitting etc. Remove scale, rust, light cracks by grinder. Stress relieving. In case of doubt of cracks dye penetration or magna flux machine is used to check the cracksLoad test is done on load testing machine for 100t to 150t. In all this procedure if component is find ok then it is dispatched to the assembly. ROLLER BEARING In passenger coaches of Indian Railway system, only single bearing type axle box arrangement is used, means only two bearing are used to support the axle. The bearing used for this purpose is of Spherical Type Roller Bearing. CONSTRUCTION:- Spherical roller bearing consist of an outer ring having a spherical race way within which two rows of barrel shaped rollers operate. These rollers are guided by an inner ring with two raceway separated by a center rib.This bearing has self alignment. Spherical roller bearings have a large capacity for radial loads, axle loads in either direction. Spherical roller bearing no. 22336/c3 with 130 mm parallel bore on the inner ring are being used on ICF type coaches. They are directly shrunk fit on the axle journals. These roller bearings are to be inspected periodically as per schedule. Fig: TOOLS AND PLANTS FOR MAINTENANCE OF ROLLER BEARING:- |S. no. |Function |Equipment used | |1. Cleaning of roller bearing |3 stage cleaning plant or pre wash, wash & water rinsing | |2. |Dismounting of spherical roller bearings |Hydraulic dismounting equ ipment-withdrawal nut | |3. |Mounting of roller bearings |Induction heater with demagnetizing device | |4. |Securing of end locking bolts |Torque wrench | |5. |Visual inspection of demounted roller bearings |Magnifying glass with light | |6. Checking of radial clearance |Long feeler gauge | |7. |Measurement of journal |Outside micrometer | | | | | | | | | DISMOUNTING OF BEARING:- ? For dismounting of bearings, special hydraulic dismounting equipment is used.This machine injects oil between the journal and bore to the inner ring with high pressure which expands inner ring resulting in breaking of interference. The bearing becomes loose on the journal and slides over it. The bearing is then removed from the journal and sent to the cleaning plant. ? All components of bearing such as inner ring, outer ring, rollers, and cage are examined for cracks, damage and breakage. If bearing is found free from all the defects mentioned above, the radial clearance is measured with feeler gauge. R adial clearance is not within prescribed limits, the bearing is rejected.RECOMMENDED RADIAL CLEARANCE LIMITS FOR BEARING IN DISMOUNTED CONDITION: |Bearing make |Radial clearance | |SKF |0. 105 to 0. 296 mm | |NBC |0. 080 to 0. 190 mm | MOUNTING OF BEARING:- ? Before mounting the bearings, it is checked that journal and shoulder diameters are within permissible limits. All direct mounted spherical roller bearing have interference fit with axle journal, therefore it requires heating and shrinkage fitting. Heating of bearings is done by using an induction heater. Fig: ? Temperature range for heating the bearing is 100 to 120 centigrade. ? Induction heating is a quick, safe, energy saving and environment friendly process. In this system, bearing is short circuited to perform as a secondary winding whereas the core winding is at primary side. Bearing is placed around a yoke. Due to principal of induction current, bearing is heated due to its electrical resistance and attains the desired temperature. It is recommended to set the machine in such a way that it takes 5 to 7 minutes to attain the temperature of 120c maximum of bearing. ? Heated bearing mounted on journal with the help of hook and it is positioned by giving light taps with plastic hammer. BEARING IS REJECTED FOR THE FOLLOWING DEFECTS: ? Pitted or flaked roller tracks and rollers. ? Cracked or deformed or badly worn out cage ? Cracked inner or outer ring ? Scored or damaged outer surface of the outer ring. ? Indentation or rings or rollers ? Scoring of roller tracks or rollers ? Corrosion damage Excessive or less radial clearance CORROSION SHOP ICF coaches incorporate a no. of pressed steel sections made of thin sheets (1. 6, 2. 0, 2. 5, & 4 mm) and plates of thickness 5 to 16 mm in the construction of the shell. These sheets are considerably stressed as the design of the coaches is based on the principle of a self supporting structure and it is essential that these coaches are maintained in good conditi on free from corrosion. Corrosion is take place when a steel surface comes in contact with moisture. For prevention the corrosion, film of paint is coated on steel surfaces.In addition to it, application of an inhibite Zinc Chromate Red Oxide Primer is done to prevent the surfaces coming in contact with atmosphere. Surfaces which are not finish painted have also been given ? coats of bituminous emulsion which gives added protection to the steel surfaces by excluding moisture along with primer. If due to some reason like abrasive action of sand, the bituminous film brake down, the inhibitive primer acts as a second line of defence. Corrosion of steel surfaces starts only when both the bituminous and the primer suffer mechanical injury.Corrosion is indicated by: ? Flaking of paints ? Flaking of metals ? Pitting and rusting Corrosion can be classified into two categories as vulnerable and not vulnerable. Vulnerable corrosion of parts means, the parts are fully corroded and they should be changed for further operation. The examples of vulnerable members in coaches are tubular frame below lavoratories, trough floor in bays, sole bar, body pillars etc. Not vulnerable parts mean the parts which are corroded to little depth and they may be use still by treatment of corrosion.The examples of mot vulnerable members are head stock inner and outer along with stiffening tubes, roof sheets, body side doors, partition walls, water tank ceiling construction, battery box etc. All the components of coaches are examined in following way for corrosion:- ? Visual inspection ? By spiked hammer ? In the inner surfaces by making g the holes in corresponding component. ? If the components are corroded excess as prescribed limit then change the component by new one. ? And if the component is not so much corroded then repair the component by scrapping old coats of paint and make new coats of paints of anticorrosive layerBRAKE GEAR SHOP Presently coaches are mounted with air brake system instead of vacuum brake system due to better braking application. The air brake used is TWIN PIPE GRADUATED RELEASE AIR BRAKE SUSTEM. In this system two pipes known as feed pipe and brake pipe are used, instead of that there are two brake cylinder on each bogie, one auxiliary reservoir, a distribution valve, a control reservoir etc. The air brake system uses compressed air supplied by the main reservoir in locomotive. The locomotive compressors charge the feed pipe throughout the length of the train .The feed pipe is connected to the auxiliary reservoir and the brake pipe is connected to the brake cylinder through the distributor valve. Brake application takes place by dropping the pressure in the brake pipe. Charging the brake system †¢ Brake pipe throughout the length of train is charged with compressed air at 5 kg/cm2 †¢ Feed Pipe throughout the length of train is charged with compressed air at 6 kg/cm2 †¢ Control reservoir is charged to 5 kg/cm2 †¢ Auxiliary reservoir is charged to 6 kg/cm2 Brake application stage For brake application the brake pipe pressure is dropped by ventilating air from the driver’s brake valve.Subsequently the following actions take place †¢ The control reservoir is disconnected from the brake pipe. †¢ The distributor valve connects the auxiliary reservoir to the brake cylinder and the brake cylinder piston is pushed outwards for applications of brakes. †¢ The auxiliary reservoir is however continuously from feed pipe at 6kg/cm2 |Description |Reduction in B. P Pressure | |Minimum Brake application |0. 5 to 0. kg/cm2 | |Service Brake application |0. 8 to 1. 0 kg/cm2 | |Full service Brake application |1. 0 to 1. 5 kg/cm2 | |Emergency Brake application |Brake pipe is fully exhausted and its pressure reduces | | |to almost zero. | Brake release stage: Brakes are released by recharging brake pipe to 5 kg/cm2 pressure through the driver’s brake valve. ? The distributor valve isolated the brake cylinder from the auxiliary reservoirs. ? The brake cylinder pressure is vented to atmosphere through DV and brake cylinder moves inwards. [pic] BRAKE CYLINDER Every coach fitted with air brake system, have two brake cylinders for actuating brake rigging for the application and release of brakes. During application of brakes the brake cylinder develops mechanical brake power by outward movements of its piston assembly, by receiving air pressure from auxiliary reservoir through the distributor valve.This mechanical power is transmitted to the brake shoes through a combination of levers. During release action of brakes the compression spring provided in the brake cylinder brings back the rigging to its original position. The cylinder body is made out of sheet or cast iron and carries the mounting bracket, air inlet connection rib and flanges to the cylinder body a dome cover is fitted with the help of bolts and nuts. The dome cover enclosed the spring and passage for the piston trunk which is connected to the piston by screws.The piston is cast iron having a groove in which piston packing is seated . piston packing is of oil and abrasion resistant rubber material and is snap fit to the piston head. The packing as self lubricating characteristic which ensure adequate lubrication over a long service period and extends seal life considerably. AUXILARY RESERVOIR The auxiliary reservoir is a cylindrical vessel made of sheet metal. On both the ends of the reservoir, flanges are provided for pipe connections. One end of the auxiliary reservoir is charged through the feed pipe to a pressure of 6 kg/cm2 .At the bottom of the auxiliary reservoir, a drain cock is provided for draining out the condensate/moisture . The auxiliary reservoir should be overhauled in every POH. DISTRIBUTOR VALVE Distributor valve is the most important functional component of air brake system and is also referred as the heart of air brake system. The distributor valve sense drop and rise i n brake pipe pressure for brake application and release capacity. It is connected to the brake pipe through branch pipe.Various other components connected to the distributor valve are auxiliary reserve reservoir, brake cylinders and control reservoir. FUNCTION OF DISTRIBUTOR VALVE For application and release of brakes the brake pipe pressure has to be reduced and increased respectively with the help of driver’s brake vale. During these operations the distributor valve mainly performs the following function. i) Charges the brake system to regime pressure during normal running condition. ii) Help in graduated brake application, when pressure in brake pipe is reduced in steps. ii) Helps in graduated brake release, when pressure in brake pipe is increased in steps. iv) Quickly propagates reduction of pressure in brake pipe throughout the length of the train by arranging additional air pressure reduction locally inside the distributor valve. v) Limits maximum brake cylinder pressu re for full service applicationemergency application. vi) Control the time for brake application and brake release depending on service conditions. vii) Facilitates complete discharge of air from the air brake system manually with the help of operating lever. iii) Protects overcharging of control reservoir when the brake pipe pressure is quickly increased for releasing the brakes. C3W DISTRIBUTOR VALVE The C3W distributor valve consists of: 1) Main body 2) Quick service valve 3) Main valve 4) Limiting device 5) Double release valve 6) Auxiliary reservoir check valve 7) Cut off valve 8) Application choke 9) Release choke OPERATION OF C3W DISTRIBUTOR VALVE For effective functioning of air brake system, the distributor valve has to operate effectively during 1) Charging stage 2) Application stage 3) Release stage 1) CHARGING STAGEDuring charging stage the compressed air flows from the brake pipe and enters into the brake pipe chamber of main valve, cutoff valve and quick service valve. Due to this pressure the various valve get activated and perform as under MAIN VALVE Due to brake pipe pressure acting on top face of the large diaphragm, differential pressure acts on the main valve. As a result the hollow stem moves downward there by connecting brake cylinder to atmosphere. In addition these because of BP pressure at top of large diaphragm it press ring and trigger. This action unlocks the CR release valve by raising upward the locking rod.CUT OFF VALVE As brake pipe pressure enters into the cut off valve it flows through the solex jet and valve, (which is held upon due to action of BP pressure on bottom side of the lower diaphragm) to the control reservoir, as the CR & BP pressure equalizes, diaphragm assembly comedown and valve reach to lap position. The control reservoir pressure now also reaches to the upper portion of top diaphragm of quick service valve and the bottom portion of large diaphragm of main valve simultaneously, the auxiliary reservoir is charge d with BP pressure reaching from cut off valve chamber- via auxiliary reservoir check valve. ) APPLICATION STAGE EMERGENCY APPLICATION During emergency application the brake pipe pressure is reduced rapidly to 0 kg / cm2 by the driver’s brake valve. Because of this drop the position of the various valves will be as described below. MAIN VALVE: With drop in BP pressure to 0 kg / cm2 differential pressure acts across the large diaphragm. As a result the hollow stem is moved in upward direction and pushes the check valve there by opening the passage for entry of auxiliary reservoir pressure at top portion of main valve. This pressure then gets a way to break cylinder through limiting device.The brake cylinder thus gets charged with the compressed air. This pressure is known as BC-pressure. LIMITING DEVICE The auxiliary reservoir pressure, which entered into the top position of main valve, now enters the limiting device through the valve, which is held open. From limiting device air pressure now enter the brake cylinder. When the BC pressure rises to 3. 8 kg / cm2 the upwards force on the diaphragm lifts the guide and the valve at the bottom of the limiting device gets closed. Thus further entry of air into the brake cylinder stops. When the brake cylinder pressure reaches 3. kg / cm2 this pressure i. e. BC pressure act on Top face of small diaphragm of main valve ? Bottom face of upper diaphragm of cut off valve ? Top (small chamber) of quick service valve Now because of this BC pressure acting at main valve small diaphragm, the hollow stem is pulled down. As a result the check valve at top comes down to close stage and assume lap position with the hollow stem closing further entry of AR pressure. CUT OFF VALVE: In cut off valve the bottom face of the upper diaphragm is subjected to BC pressure because of which guide is lifted.Also the upper portion of lower diaphragm is subjected to CR pressure, which pushes the total assembly downwards. This action close s the valve off cut off valve, these by isolating it from control reservoir pressure. QUICK SERVICE VALVE In quick service valve BC pressure acts at the top of valve and control reservoir pressure act at top face of upper diaphragm, As a result the stem is pushed down BP pressure inside the DV is at â€Å"0† kg / cm2 the residue BP pressure from the bulb of quick service valve will flow back and vent to atmosphere with the BP line.GRADUATED APPLICATION During graduated brake application the brake pipe pressure is draped in steps by driver is brake valve. The movement of various valve assemblies is almost in the some direction as during emergency application, but their movement is comparatively less. In the main valve however after each application the hollow stem assumes the lap position with the check valve. In addition to this during graduated application the bottom valve of limiting device is held open to allow compressed air to enter into brake cylinder. When BC pressure reaches 3. kg / cm2 the bottom valve in the limiting device gets closed, similarly at the time of full service application as the BC pressure reaches 3. 8 + 0. 1 kg / cm2 within specified time, the position of various valve assemblies will be the same as described above. 3) RELEASE STAGE When the brake pipe pressure is increased in steps for graduated release of breaks the position of different valve is as described below. MAIN VALVE At the top face of large diaphragm as the BP pressure increases, the hollow stem is moved down ward leaving its lap position with check valve.The BC pressure thus finds a passage from top of hollow stem to exhaust to the atmosphere. This action reduces pressure on top of the upper diaphragm and the hollow stem engine lifts up to lap position. It closes the hollow stem top portion. The some cycle is repeated when BP is increased during next stage. In this way graduated release effect is obtained. CUT OFF VALVE; As the BP pressure increase the position of cut off valve remains similar as in graduated application i. e. the cut off valve will remain close isolating CR pressure from brake pipe pressure. QUICK SERVICE VALVEWhen the BP pressure is increased then as explained above from the main valve the BC pressure gets exhausted to atmosphere. This action gradually reduces the BC pressure. When BC pressure reduces to 0. 8 kg / cm2 during brake release, the force at the top of the quick service valve, becomes comparatively less than BP pressure present in Quick service valve. As a result the valve at top gets lifted thereby giving passage to blocked BP pressure to atmosphere with the exhaust of BP pressure the quick services valve of the distributor valve again gets ready for next brake application. MANUAL RELEASEDouble release valve provides for accelerated manual brake release when is particularly useful during shunting operation. A short pull on the lever of double release valve is all that is needed. This action opens the control re servoir release chock valve, which is then held open by the locking rod, venting control reservoir through the open control reservoir release check valve brings the main valve to release position and exhaust the brake cylinder pressure through the hollow stem. PASSENGER EMERGENCY ALARM SYSTEM It consists of two components: 1. Passenger emergency alarm signal device (PEASD) 2. Passenger emergency alarm valve(PAEAV)These two components in combination give an indication to the e driver that some passenger is in need to stop the train. The indication is transmitted from the coach when the passenger pulls the chain. Passenger Emergency Alarm Signal Device:- PEASD is a manually operated pilot vent valve. It is operated through mechanical force exerted by pulling the alarm chain provided inside the coaches for emergency use. Passenger Emergency Alarm Valve:- Passenger coaches are fitted with an alarm chain pull arrangement. Alarm chain is connected to the two PEASD which are situated at ei ther side of one end wall of the coach.PEASD’S are connected to the PEAV through a 10mm control pipe. BP pressure is fed to the PEAV through a 20mm branch pipe, in the event of alarm chain pull air is depleted form the control pipe connecting PEAV and PEASD causing BP pressure to exhaust through the 4 mm choke in the PEAV. This causes partial application of brakes. This drop in pressure in the brake pipe line is also observed in flow meter fitted in the locomotive for the driver to stop the train. LIFITING SHOP The main constructional and design feature of the ICF/RCF all-coil bogies, used on mainline BG coaches are briefly described as follows: |S. No. Description |Parameters | |1 |Maximum Axle load bearing |16,25t,13t | | |capacity | | |2 |Wheel base |2896 mm | |3 |Wheel Diameter |915 mm | |4 |Axle guidance |Telescopic axle guide with oil damping | |5 |Primary suspension |Coil spring | |6 |Secondary suspension |Coil spring | |7 |Shock absorbers |Vertical dashpot in prim ary suspension | | | |Hydraulic double acting vertical shock | | | |Absorber in secondary suspension. |8 |Transfer of coach body weight |Through bogie side bearer pitched | | | |at 1600mm | ALL-COIL ICF BOGIE The bogies being currently manufactured by ICF/RCF which have been accepted as standards of the Indian Railways and are of an all welded light weight construction. Axles are located on the bogie by telescopic dash pot and axle guide assemblies. Helical coil springs are used in both the primary and the secondary stages. The axle guide device provides viscous damping across primary springs while hydraulic dampers are provided across the secondary stage.Dampers are protected against misalignment by resilient fittings. Isolation of vibration is effected by rubber pads in primary and secondary suspension. Deflection due to the tare weight is almost equally divided between axles and bolster springs. Weight of coach body is transferred to its bogie by side bearers consist of lubricate d metal slides immersed in oil baths. No vertical weight transfer is affected through bogie pivot and the pivot acts merely as a centre of rotation and serves to transmit tractive / braking forces only. BOGIE ASSEMBLY The bogie frame and components are of all-welded light construction with a wheel base of 2. 896 metre.The wheel sets are provided with self-aligning spherical roller bearings mounted in cast steel axle box housings. Helical coil springs are used in both primary and secondary suspension. The weight of the coach is transferred through side bearers on the bogie bolsters. The ends of the bogie bolsters rest on the bolster helical springs over the lower spring beam suspended from the bogie frame by the inclined swing links at an angle 70 . Hydraulic shock absorbers and dash pots are provided in the secondary and primary suspensions respectively to damp vertical oscillations. AXLE BOX GUIDE WITH DASH POT ARRANGEMENT Axle box guides are of cylindrical type welded to the botto m flanges of the bogie side frame with close dimensional accuracy.These guides together with lower spring seats located over the axle box wings house the axle box springs and also serve as shock absorbers. These guides are fitted with guide caps having nine holes of diameter 5 mm equidistant through which oil in the lower spring seat passes under pressure during dynamic oscillation of coach and provide necessary damping to primary suspension to enhance better riding equality of coach. This type of rigid axle box guide arrangement eliminates any longitudinal or transverse relative movement between the axles and the bogie frame. The quantity of oil required to achieve 40 mm oil lever above the guide cap in modified arrangement is approximately 1. 6 liters and in unmodified arrangement is approximately 1. 4 litters. AIR VENT SCREWSOn the bogie side frames, directly above the dash-pots, tapped holes are provided for replenishing oil in the dash pots. Special screws with copper asbestos washers are screwed on the tapped hole to make it air light. BOGIE BOLSTER SUSPENSION The bolster rests on the bolster coil springs- two at each end, located on the lower spring beam which is suspended from the bogie side frame by means of bolster-spring-suspension (BSS) hangers on either side. The two anchor links diagonally positioned are provided with silent block bushes. The links prevent any relative movement between the bogie frame and coach body. SPRINGS In ICF bogie, helical springs are used in both primary and secondary suspension.The springs are manufactured from peeled and centre less ground bar of chrome vanadium/chrome molybdenum steel conforming to STR No. WD-01-HLS-94(Rev. 1) CENTRE PIVOT ARRANGEMENT The centre pivot pin joins the body with the bogie and transmits the tractive and braking forces on the bogies. It does not transmit any vertical load. It is equipped with rubber silent block bushes which tend to centralize the bogies with respect to the body and, to some extent, control and damp the angular oscillations of the bogies SIDE BEARERS The side bearers are provided to support the weight of the coach. It consists of a machined steel wearing plate immersed in an oil bath and a floating bronze-wearing piece with a spherical top surface kept in it, on both sides of the bogie bolster.The coach body rests on the top spherical surface of these bronze-wearing pieces through the corresponding attachment on the bottom of the body-bolster. The whole arrangement is provided with a cover to prevent entry of dust in the oil sump. ANCHOR LINKS The floating bogie bolster which supports the coach body is held in position longitudinally by the anchor links which are pinned to the bolster sides and the bogie Transoms. One anchor link is provided on each side of the bolster diagonally across. The links can swivel universally to permit the bolster to rise and fall and sway side wards. They are designed to take the tractive and braking forces. The anchor link s are fitted with silent block bushes SILENT BLOCKThis is a synthetic rubber bush fitted in anchor link and center pivot of ICF bogies to transmit force without shock and reduce noise. EQUALISING STAYS This Device has been provided on bogies between the lower spring plank and the bolster to prevent lateral thrust on the bolster springs which have not been designed to take lateral force. These links have pin connection at both ends and therefore can swivel freely. BOLESTER SPRING SUSPENSION HANGERS (BSS HANGERS) In the secondary suspension the bolster is supported on helical coil springs which are placed on the lower spring plank is suspended from the bogie side frame through BSS hanger on hanger blocks. SHOCK ABSORBERSHydraulic shock absorber is also provided to work in parallel with the bolster springs to facilitate damping for vertical oscillations. WORKSHOP MAINTENANCE- BOGIE SHOP 1. Coach Lifting 2. Bogie cleaning 3. Bogie dismantling 4. Component cleaning 5. Attention to compon ents 6. Repair of components 7. Bogie assembly 8. Load testing and adjustment 9. Lowering of coach 10. Final adjustment OBJECT:- To study inspection & testing procedure of helical spring of coaches also suggest methods of improvement to reduce rejection & prevention from corrosion. USE OF SPRINGS:- Springs are used in the suspension system of coaches to absorbs the jerks developed during running of coach and provide comfort to the passengers. INSPECTION OF SPRINGS:- Springs are inspected during every POH.The inspection procedure is as follows: ? Springs which are lowered from the bogie are sent for the washing in spring section. Here the springs are dipped in the caustic soda tank for 12 to 16 hrs. so the oil, grease, scale etc are cleaned. ? Springs are then washed by the water jet. ? Visually inspect the springs for breakage, welding marks, cracks and corrosion pits. ? Shot peening for surface finish and fatigue relief of springs. ? Cracks are tested in magna flux machine. ? Codin g of springs ? Anti corrosive coating of red oxide, and painted. ? Load test ? Grouping SHOT PEENING:- Shot peening is done for the surface finish and fatigue relief of springs.In shot peening process small particles of chilled iron are blasted on the springs with high velocity, so these particles works as abrasive and take away a fine layer of metal with it. And the surface of springs looks clean. Rotary Table Type Shot Blasting machine is used for the shot peening process. This machine has two tables which alternately loaded by springs. The max. dia of job is 1800 mm and load carrying capacity is 2500kg.. At a time 25 axle box springs or 18 bolster springs can be shot peened by the machine. TESTING OF CRACKS:- It is nondestructive method of testing. Magna flux machine is used for detection of cracks in spring. The spring is first bathed by the solution of flouroscent, iron powder and kerosene.Then the springs are magnetized by the machine with clamping in machine itself. When the springs are magnetized, the springs are lightened by the ultraviolet lamp. Since the process is done in the dark room, so if the springs have cracks then this flouroscent shines which penetrated in the springs due to crack ness and detection of cracks is done so the spring will rejected. LOAD TEST:- After coding and coating of paint the springs are sent to the load test. The springs are tested for the 2000ton load and this load is kept for 1 to 2 minutes. If the springs can sustain this load with limited deflection then springs are selected else rejected. METHODS OF IMPROVEMENT:- Use the springs made of standardized material as suggested by Railway’s Standard. ? The springs should be made of fine grained spring steel. ? Use the springs manufactured by the authentic company and also notice the manufacturing process of springs should be according to the standardized method. ? 100% of springs should be checked for all the test procedure. PREVENTION FROM CORROSION:- Springs shoul d be coated with the anticorrosive paint and black bituminous paint. ———————– Technician 2 Technician 1 Senior technician Supervisor Supervisor Junior Engineer 2 Junior Engineer 2 Junior Engineer 1 Junior Engineer 1 Section Engineer Senior Section Engineer (SSE) Helper

Substitution and Income Effects Essay Example | Topics and Well Written Essays - 1250 words

Substitution and Income Effects - Essay Example In this essay, the conception of income as well as substitution effect has been clearly portrayed and certain significant scenarios have been taken into concern on the basis of which the implication of the income or the substitution effect or both the effects will be depicted in the discussion. The researcher discusses six different scenarios, such as Drove Less and Purchased Less Gasoline, You Ate Out Less Often, You Took Public Transportation More Often, You Bought a Bicycle, You Did Not Take a Vacation Away From Home and You Bought Fewer Clothes and Made Due with More around the Home and provides a detailed analysis of each one. The researcher also demonstrates his analysis with graphical portrayals. The researcher then concluds that the valuable conceptions that include income as well as substitution effects are associated with the subject matter of macroeconomics and pose significant influence upon the demand of a particular buye. The consequences due to the effect of income alo ng with substitution effect also play an imperative part in determining the budget factor by a considerable extent. The role and the outcome of both the effects have been depicted on the basis of the provided situation that is based upon the theory of purchasing power of the consumers or buyers. The application of the individual as well as the combined effects i.e. income as well as substitution effects have also been performed in each of the scenario in order to justify the purchasing power of the buyers or consumers.

Marketing Assignment Example | Topics and Well Written Essays - 500 words

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Criminal Law Case Report Essay Example | Topics and Well Written Essays - 750 words

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Visual Analysis Art Essay Example | Topics and Well Written Essays - 1000 words

Visual Analysis Art - Essay Example According to, For Entry to University and College, the structure acts as a base for the students to recreate markedly on the hot days as denotable from the freshmen. It allows the students to skate, walk, and even cycle at the vicinity; furthermore, the location of the structure creates a splendid walkway on and off along the campus especially in the winter periods and even towards the engineering mall. The structure has had it challenges in equal measures despite the marvelous attraction and praise. Consistent with, A University of Tradition: The Spirit of Purdue, the threat exposed by the structure to small children is quite insurmountable to warrant its operations. For instance, in April 2001, the structure had stalled for some periods. It even attracted the attention of the administration to the extents of even rethinking of laying fences around the structure. Massive pressure created by the water jets continually knocked children on the along the structure thus inhibiting or eve n concealing the rather finely designed and projected engineering work. The local people however permitted their children to get jovial around the structure, but this was to conducted under supervision of an older person, for instance their parents. While the structure was excellently designed, personally I feel that it does not meet the thresholds for safety. Possibly, the location or even design architecture had gross errors. In any engineering or artwork safety comes first. Probably redesign of the structure could restore the desires of the initial creator. The conspicuously high pressure is inconsistent and inapplicable to the ambience habituated by children. Possibly, design of a small obstacle or fences around it could probably reassure the essence of the structure. The implementers of the design did a laudable job by using long term existing materials including concrete and blocks (Pipes, 2003). Landmarks similar to the ‘Engineering fountain’ are susceptible to t he erosion factors, rain and water being the chief causatives of the wide spanning corrosion conditions. The choice of the blocks ascertains the durability anticipated by the initial designers of the structure thus exposing the envisaged long existence. Goods application of cement and quality exhibits unnatural strength in the material structure as notable from the pyramids of Egypt and the highly erected quality expands the established feature for the far based visibility of the structure. At night, the highly adorn lights paints the section under which the projects sits sparkling cream appearance that even adds to the already outstanding form to expound on the beauty. While the art points to heaven and at top of it during the night light shines resembling the biblical star that directed the Wiseman to the birth place of the king (Jesus). The vast space allocated near it offers ample time during the view of the remarkable design. Confirmable from, A University of Tradition: The Spi rit of Purdue, while in terms of aesthetic value, the structure achieves great scoring in terms of points; however, the president of the Purdue and the university architect had to absorb certain amount of pressure and complaints directed to them due the hindrance notable in the project. Apparently, the project was Martin Jischke’s first project in the university. The eventual formation of a community organized committee to seek the way forward on the matter explains the vital

Marketing Communications Plan Case Study Example | Topics and Well Written Essays - 3750 words

Marketing Communications Plan - Case Study Example Once Zara have carefully analysed the internal and external business environment and critically examined the industry in general the most suitable marketing strategies will be selected and these strategies will be administered by effectively and continually monitoring external threats and opportunities and revising internal efficiency procedures. The market analysis investigates both the internal and external business environment. It is vital that Zara carefully monitor both the internal and external aspects regarding its business as both the internal and external environment and their respective influences will be decisive traits in relation to its success and survival in the industry. The internal business environment and its influence is that which is to some extent within the business's control. The main attributes in the internal environment include efficiency in the production process, through management skills and effective communication channels. To effectively control and monitor the internal business environment, Zara must conduct continual appraisals of the business's operations and readily act upon any factors, which cause inefficiencies in any phase of the production and consumer process (Tremblay and Martins-Filho, 2001). The External business environment and it... Changes in the external environment will create opportunities or threats in the market place Zara must be aware of. Fluctuations in the economy, changing customer attitudes and values, and demographic patterns heavily influence the success of Zara products in the market and the reception they receive from the consumers. SWOT Analysis: SWOT stands for Strengths Weakness Opportunities Threats. SWOT analysis is a technique much used in much general management as well as marketing scenarios. SWOT consists of examining the current activities of the organisation- its Strengths and Weakness- and then using this and external research data to set out the Opportunities and Threats that exist. Strengths: Zara has been a complex part of UK culture since almost a decade. The product's image is loaded with over-romanticizing, and this is an image many people have taken deeply to heart. The Zara image is displayed on T-shirts, hats, and collectible memorabilia. This extremely recognizable branding is one of Zara's greatest strengths. Additionally, decreased expenditure on advertising is one of their greatest strengths. It allows them to conduct business on a global scale while at the same time maintain a local approach. Weaknesses: Weaknesses for any business need to be both minimised and monitored in order to effectively achieve productivity and efficiency in their business's activities, Zara is no exception. Although domestic business as well as many international markets are thriving but Zara has recently reported some declines in unit case volumes in different markets of the world. Opportunities: Brand recognition is the significant factor affecting Zara's competitive position. Zara's brand name is known well throughout the world today. The primary concern

Positivism as an Epistemological System Essay Example | Topics and Well Written Essays - 1500 words

Positivism as an Epistemological System - Essay Example Thus, there can be no room for any mystical abstractions in explaining phenomena. In the second wave of positivist thought, a second form of positivism, i.e. logical positivism took place, and â€Å"took advantage of the further progress made in the hard sciences to insist on purging all metaphysics from the scientific method† (Jordan, 2004, p.28). â€Å"Logical positivist views about science and knowledge were based on a general theory of language. †¦This theory of language featured two main ideas, the analytic-synthetic distinction and the verifiability theory of meaning† (Godfrey-Smith, 2003, p.25). I will discuss these ideas in detail in the next section. The third wave of positivism is generally attributed to a group called the Vienna Circle. â€Å"The Vienna Circle was established by Moritz Schlick and Otto Neurath. †¦But from the early days through the end, a central intellectual figure here was Rudolf Carnap† (Godfrey-Smith, 2003, p.22). In this stage, positivism was carried in its logical form. However, some positivists prefer to regard this latter period as logical or scientific empiricism (Greetham, 2006, p.121), to distinguish it from the previous logical positivist movement. In this essay, I shall use the term logical positivism to refer to the whole of 20th century positivism, to distinguish it from Comte’s 19th century positivism. Positivism as Epistemology From a general perspective, positivism is considered to be an epistemological system through its advocacy of attaining empirical knowledge through sense perception, and its adherence to the scientific method i.e. induction. However when logical positivism stepped into the picture, it was made clear that â€Å"logical positivism had other roots... The first part of the paper consists of an historical analysis of 19th century positivism, logical positivism, up until the period of the Vienna Circle. The second part covers the epistemological implications of positivism. Here,the main tenets of logical positivism and its adherence to epistemology are discussed. A main figure that it will be discussed here is Karl Popper. Finally, this paper is concluded by discussing the fall of positivism. The paper stresses that progress and development in knowledge is an endless endeavor. Since the birth of positivism up until its downfall, positivism nevertheless shaped the manner by which we do science. The authod talks that one is the breakdown of the view of language that formed the basis of many logical positivist and logical empiricist ideas. Another is pressure from holistic arguments. A third is the frustrating history of attempts to develop an inductive logic. A fourth is the development of a new role for fields like history and psychology in the philosophy of science. The report makes a conclusion that positivism succeeded in developing a systematic method of approaching reality. And scientific knowledge was the very basis for reconstructing reality, with scientific laws as central in research. If epistemology is the study of knowledge, then positivism is a valid epistemological system. For if there is one thing that positivism established, it is no other than a coherent reconstruction of human knowledge based on the methods and principles of science itself. It is in this regard that positivism, despite its fall, proved to be influential throughout history.

Characteristics of Just Laws And Views Essay Example for Free

Characteristics of Just Laws And Views Essay A just law has a number of widely recognized characteristics. A just law is characterized by the following: treats all people equally The notion of equality is an important aspect of the law. Although a just law may be providing equality it doesn’t always occur that way. For example, a wealthy person may be able to afford legal representation, but those people who can’t afford legal representation will be disadvantaged and will not have an equal opportunity before the law. is based on generally held religious or ethical precepts The common law legal system is the product of various historical influences, many of which were the religious and moral viewpoints of different times. In today’s society, ethics and how they coincide with the law are being replaced by the need for the law to protect society as a whole and consider economic interests. is utilitarian Utilitarianism is the theory which suggests the law aims to ensure the greatest possible happiness for the greatest possible number of people. stresses consensus and social cohesion above all Democracy helps create legal consensus. Democratic processes provide all citizens within the state with the opportunity to develop or create the law. Democratic processes will generally require a majority or consensus to bring a law into being. Democratic processes are designed to endure the survival and well being of the community through stressing consensus. allows for general principles to be mitigated in individual cases Mitigation allows for fairness. The law attempts to treat everyone equally; that = everyone in similar situations is taxed the same, everyone who commits the same crime is given the same penalty. However the courts have discretion to reduce the penalty according to the circumstances. aims to redress inequalities It leaves people free To the extent that people do not break the law, a just law will leave people free. It takes into account of limitations in material resources. It can be invoked without undue delay. A just law should deal with a legal problem or dispute as soon as practicable after that problem or dispute arises. This is because people’s memories fade and so their evidence becomes less reliable as time passes. But this is not always the case, as currently the Australian legal system has lengthy delays and cases take long periods of time to reach the courts. Formal Equality – theory side of the actual practice. Here in theory everyone in Australia is treated equally and given the same opportunities Institutionalized equality- this is the practical side to it. Although it seems everyone in Australia is equal there are people in sub groups in society who are part of a minority and aren’t able to benefit from the opportunities. E.g. of formal equality: Everyone has to right to access the law. Everyone has the right to vote EQUALITY OF OPPORTUNITY-Equal treatment of people in access to employment and services. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..So everyone has the right to apply for a job. They have equal rights to a safe working environment. (work cover). Everyone has the equal opportunity to access the minimum wage. EQUALITY BEFORE THE LAW-Everyone is treated equally in their dealings with the law. E.g. The rule of law. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦So everyone has the implied right to legal representation. All Australian citizens are allowed to contest evidence put forward during court (natural justice – cross examination). EQUALITY OF OUTCOMES-A practice whereby the law, policy or precedent aims to ensure that, regardless of educational or socioeconomic background, or inequality of opportunity, the result of certain exercises will be equality†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..so legal aid, if people aren’t able to afford legal representation they are given the opportunity to apply for legal aid. Does formal equality before the law hides institutionalized inequality? This relates most to EQUALITY OF OUTCOMES because this area is where the law has its most flaws. Although everyone might have the same opportunity not everyone is able to understand that system. For example unskilled migrants who come to Australia looking for a better life think Australia has equal everything†¦true but its not equal if you don’t understand it and aren’t familiar with it. For example: if you come from a non – English speaking background to Australia and get into trouble with the law or are being framed or a victim of fraud and exploitation how are you going to access the law and legal representation if you cant speak the language and don’t understand the system. Therefore not an equal opportunity.

According to mankiw and taylor

According to mankiw and taylor a) According to Mankiw and Taylor (2006), unemployment means that inability to obtain a job when one is willing and able to work. Even though there are several different ways to measure unemployment, this can be normally measured in two ways: the claimant count and the Labour Force Survey (LFS). Grant (2000) states that the claimant count is the traditional measure of unemployment in the UK. The number of people between the ages of 18 and 60 claiming unemployment benefit payments such as job seekers allowance from the government is counted as the claimant count. Therefore, it is relatively cheap and easy to gather data. However, many economists believe that there are some significant problems with the claimant count method because of the accuracy of this measure. Powell (2005:p.290) tells us, the claimant count overstates true unemployment because many claimants are either not genuinely looking for work or not genuinely unemployed because they already have undeclared jobs in the informal economy. In other words, some people who are working in the black economy and who are not looking for work are included in the claimant count. However, in other ways, it understates true unemployment. The rationale behind this is that the claimant count does not include unemployed people who are aged under 18 or over 60 or who do not claim unemployment benefits. Furthermore, some unemployed workers approaching retirement are also removed from the register. The Labour Force Survey (LFS) is now recognised as the second measure of unemployment. According to Grant (2000), the LFS is also known as the ILO (International Labour Organisation) measure because it uses the ILOs definition of unemployment. Contrary to the claimant count, all people who are actively looking for a job in the last 4 weeks are counted as unemployed workers whether they are claiming benefits or not. Both the claimant count and the Labour Force Survey (LFS) have its own advantages and disadvantages. However, both measures might understate the actual unemployment. According to Powell (2005), the reason is that they do not count discouraged workers who have given up finding jobs and people who are classified as economically inactive. Unemployment can be defined and categorised in a number of types and ways. Therefore, in this paper, it will be classified in accordance with its causes. First of all, there is equilibrium unemployment. Grant (2000) tells us that equilibrium unemployment exists when the aggregate demand for labour is equal to the aggregate supply of labour and vacancies match with the number unemployed. However, although there is equilibrium at wage rate, people might still unemployed because the vacancies are uninformed to them or they are unacceptable or unwilling to take up the vacancies. The graph below shows equilibrium unemployment. (adopted from Powell: p.293) This equilibrium unemployment is measured by the distance between Z and X or E1 EFE. In addition, ASLN curve shows all the workers who are willing to work at different real wage rates. According to Grant (2000), there are different types of equilibrium unemployment such as frictional, search, casual, seasonal, structural, technological and residual unemployment. Frictional unemployment occurs where people are between jobs. Because of immobilities in the labour force, a delay or time-lag is created while unemployed workers move from one job to another. Therefore, it explains why people are able to remain unemployed despite there are job vacancies available. Powell (2005) states geographical and occupational immobilities of labour explain why unemployed workers are prevented from filling job vacancies immediately. For example, the cost of moving and difficulties of obtaining housing are among the causes of geographical immobility. In addition, occupational immobility is caused by the need for training and the effects of restrictive practice and discrimination in labour markets. Grant (2000) says that search unemployment is a form of frictional unemployment. The newly unemployed workers who have just lost their jobs or who have voluntarily left their jobs might take a gap before getting a new job. The reason is that they need to search labour markets to see better-paid or higher status employment is available. Therefore, search unemployment takes place when unemployed workers do not accept the first job offer to search for better-paid or higher status employment. Some kinds of unemployment occur when certain groups of workers are out of work between periods of employment. According to Grant (2000), casual unemployment, one of the specific cases of frictional unemployment, takes place because of that reason above. In other words, casual unemployment occurs when workers are unemployed on a short-term basis in trades. For example, workers in the tourism sector, construction industry and agricultural work. Powell (20005) states that seasonal unemployment is casual unemployment and it occurs in some industries suffering seasonal fluctuations in demand. Industries such as farming, tourism and building experience such seasonal patterns of demand. Therefore, fruit pickers and deck chair attendants can be an example of seasonal unemployment. Besides, there is structural unemployment. People can be unemployed because of the changing structure of the economy. According to Powell (2005), structural unemployment arises from the structural decline of industries. For instance, if there are more efficient competitors in the market or there is the decline of demand, the workers in those industries will be becoming unemployed e.g. coal-miners in the UK. Further, he says that structural unemployment occurs when industries change their skill requirements. For example, industries ask new skill requirements when they change or introduce ways of producing their products. Structural unemployment has some different forms like frictional unemployment. Technological, regional and international unemployment are forms of structural unemployment. Technological unemployment is a form of structural unemployment. Grant (2000) say that technological unemployment results from the introduction of new technology such as labour-saving technology. Therefore, there will be automation as a result of introducing new technology. Through automation, industries can reduce their demand for labour even though their output is expanding. Accordingly, it can be defined technological unemployment results from those industries using labour-saving technology such as the use of telephone banking and plastic cards. Like technological unemployment, regional unemployment is also connected with structural unemployment. Grant (2000) states that regional unemployment takes place when the declining industry is linked to a specific area. In other words, it occurs because of the decline or closure of a major employer in a particular area. For example, in the UK, the decline of textile and shipbuilding created a pool of unemployed workers in some regions. According to Grant (2000), international unemployment is also a form of structural unemployment. It occurs when the demand for domestically produced goods and services falls and, consequently, there are increased workers losing their jobs. For example, if there are more efficient competitors abroad, consumers might choose goods and services that are produced out of the country. Therefore, the demand for domestically produced goods and services might decrease then firms will reduce their employees or will be closed. Finally, there is residual unemployment as a type of equilibrium unemployment. Mankiw and Taylor (2006) state that residual unemployment takes place when people are unwilling to work or are not able to work due to disability. Basically, people who are unemployable on a permanent basis cannot meet the demands of modern production methods and the disciplines. Therefore, it can take place in all societies. Disequilibrium unemployment is another kind of unemployment except for equilibrium unemployment. According to Grant (2000), there are two conditions for occurring disequilibrium unemployment. One is that the aggregate supply of labour must exceed the aggregate demand for labour. Another condition is that wages are sticky downwards (wage stickiness). The graph below shows that there is disequilibrium unemployment of LLZ at the wage rate W. (adopted from Grant: p.536) According to Powell (2005), there are two main types of disequilibrium unemployment: classical or real-wage unemployment and cyclical, Keynesian or demand-deficient unemployment. Classical unemployment or real-wage unemployment takes place when wages are fixed at a higher real rate rather than real-wage rate and labour market, caused by trade unions or a government-set minimum wage, prevents the real wage rate falling below these higher wages. The graph below shows classical or real-wage unemployment. (adopted from Powell: p.297) If labour markets are sufficiently competitive, the market mechanism begins to reduce disequilibrium wage rate to eliminate the excess supply of labour in the market. However, labour market rigidity or wage stickiness prevents the real wage rate falling below W1. Because of labour market rigidity or wage stickiness, there is the excess supply of labour in the markets and, consequently, classical or real-wage unemployment persists. According to Powell (2005), demand-deficient unemployment (also known as cyclical unemployment or Keynesian unemployment) stems from leakages or withdrawals from the circular flow of income and from the negative multipliers that are then unleashed. In other words, an under-full employment equilibrium occurs because of a continuing lack of effective aggregate demand. For example, the flow of income might fall by the size of the net leakage multiplied by the national income multiplier when planned leakage exceeds planned injections. Powell (2005) states that demand-deficient unemployment illustrates the paradox of thrift. It comes from the fact that saving becomes a vice at the aggregate level if people save and others are prohibited from spending the saving. For instance, demand for goods and service reduces when the market is in the recession of business cycle below the trend. Therefore, firms do not need to produce many goods to satisfy decreased consumers demand so that less labour is needed. The lower the demand for goods and services, the less the demand for labour is needed. Consequently, firms will reduce the number of their employees then the unemployment will increase. Powell (2005: p.299) tells us, Inflation is best defined as a persistent or continuous rise in the price level, or as a continuing fall in the value of money. Like unemployment, there are some methods to measure inflation: the retail price index (RPI), the PRIX, the RPIY and the consumer price index (CPI). The retail price index (RPI) shows changes in the price of average persons shopping basket. According to Powell (2005), the RPI was used by UK government to measure changes in the rate of inflation until 2003 and it measures the headline rate of inflation. The RPI is based on a monthly survey of the prices of consumer goods and services and it is therefore, calculated through a weighted average of each months price changes. However, it is impossible to measure all prices. Therefore, the RPI contains 650 items as a representative sample and those items are regularly changed to reflect new products and changing tastes. For instance, subscriptions for Internet service and digital cameras newly entered index compilation. The RPIX is the retail price index excluding mortgage interest payments. Powell (2005) says that the RPIX measures the underlying rate of inflation. In other words, it is measured by the formula: the headline rate minus mortgage interest rates. The RPIX only includes the council tax while the RPI includes the council tax and the mortgage interest rate. Furthermore, it is used to measure the cost of living of a representative family in the economy as the CPI does. Marcouse et al (2003) tell us that the RPIY is similar to the RPIX. However, it excludes indirect taxes as well as the mortgage interest. The consumer price index covers the prices of consumer goods. It attempts to measure the cost of living of a representative family in the economy like the RPIX. The CPI includes investment goods and goods purchased by the government while the mortgage interest rate and the council tax are excluded from the CPI. According to Powell (2005), in the UK, the CPI will replace the RPI and the RPIX completely because it is based on the method of measuring the price level used in the European Union. Inflation can be defined and classified in accordance with its causes. There are two different types of inflation: demand-pull and cost-push inflation and those two types of inflation are classified by Keynesians. Demand-pull inflation is caused by too much demand in the economy. In other words, demand-pull inflation occurs when there is too much money chasing too few products. For example, oil and steel. According to Grant (2000), an increase in aggregate demand must rise real output and the price level once the countrys resources are fully employed. The graph below uses a short-run AD/AS diagram to show demand-pull inflation. (adopted from Powell: p.306) When the government rises aggregate demand from AD1 to AD2, the government can eliminate demand-deficient unemployment and create full employment although real output and the price level increase. However, once full employment arrives, a further increase of aggregate demand may cause an upward movement of aggregate demand, shifting the aggregate demand curve from AD2 to AD3 and then excess demand (the vertical distance between W and Z) is created. Although there are several different conditions causing demand-pull inflation, wartime might be an appropriate example. The graph above also illustrates an inflationary gap which is the vertical distance between W and Z. Powell (2005: p.306) tells us, An inflationary gap measures the extent to which excess demand exists at the full employment level of real income or output. Similarly, a deflationary gap measures the extent to which there is deficient aggregate demand. Cost-push inflation occurs as a result of a rise in the costs of production which are not caused by excess demand. Therefore, there is the difference between demand inflation and cost-push inflation. According to Powell (2005), cost theories of inflation are based on the cause of inflation in structural and institutional conditions on the supply side of the economy. Cost-push inflation is illustrated in the graph below. (adopted from Powell: p.307) An increase in cost will cause a shift in the aggregate supply curve to the left (SRAS1 to SRAS2). The effect of this is to raise prices from P1 to P2 and then the quantity demanded will move from Y to Y1. Therefore, the macroeconomic equilibrium will be moved from X to Z and, consequently, the new macroeconomic equilibrium will be at point Z. According to Grant (2000), there are several causes in which costs might increase independently of the state of demand. First of all, wage push inflation can lead to cost-push inflation where trade unions force wages levels to increase independently of the demand for labour. Another example is a rise in prices of imported materials. Finally, a rise in indirect taxation also gives an example which leads to cost-push inflation. b) (data for this graph adopted from the handout) The graph above shows changes in retail price change and unemployment between 1986 and 1995. It can be clearly seen that there is the relationship between the retail price % change and unemployment rate and those are inversely related. The retail price % change increased from 3.4% to 9.5% between 1986 and 1990. During that period, the unemployment rate decreased from 11.2% to 5.9%. However, once, the retail price % change reduced from 9.5% to 5.9% in 1991, the changes in unemployment started to raise from 5.9% to 8.1%. Between 1991 and 1993, there was a decrease in retail price change from 5.9% to 1.6% while the unemployment rate increased from 8.1% to 10.4%. However, by 1994, the changes in unemployment reduced again (from 10.4% to 9.3%) when the changes in retail price change increased from 1.6% to 2.5%. In 1995, the unemployment rate still decreased while the retail price % change increased. The changes in retail price change was at the peak in 1990 when the unemployment rate recorded the lowest rate (5.9%) in the same year. In 1993, the changes in retail price change and unemployment are different. The retail price % change reached the lowest rate (1.6%) when the unemployment rate recorded the highest rate (10.4%) in 1993. Overall, there was a decrease in unemployment rate when the changes in retail price change increased. By contrast, the unemployment rate raised when the changes in retail price change decreased.In other words, the unemployment rate decreased at first, then increased and decreased again. However, contrary to the changes in unemployment, the changes in retail price change increased at first, then decreased and increased again during the same period. Therefore, the relationship between changes in retail price change and unemployment can be analysed that a stable relationship exists between them and they are inversely related. The graph below shows an inverse relationship between retail price % change and unemployment directly. (data for this graph adopted from the handout) Moreover, we can notice unemployment is low when retail price % change is high and unemployment is high when retail price % change is low from the two graphs above. c) There are some facts which can be expected from the data and question b. First of all, there is an inverse relationship between inflation rate and unemployment. Therefore, we can expect when inflation rate is low, unemployment is high and, conversely, unemployment is low when inflation rate is high. From this negative association, we are able to expect that unemployment might be changed as a result of changes of inflation rate. It means that there are changes of inflation rate first then the changes of unemployment will happen. Apart from these two facts, the data show the changes regularly repeated. Accordingly, we can expect that inflation can be affected by external factors and governments might be able to influence changes in the rate of inflation and unemployment through choosing their preferred combination of unemployment and inflation. First of all, the relationship between inflation rate and unemployment can be explained by Philips curve analysis. According to Powell (2005), A. W. Philips argued that the inverse relationship existed between unemployment and the rate of price inflation. This relationship is illustrated by the Philips Curve as shown in the graph below. (adopted from Powell: p.308) The Philips Curve above shows a negative association between unemployment rate and inflation rate. When there is high inflation, unemployment is low and when there is low inflation, unemployment is high. Moreover, Powell (2005) states that the Philips Curve suggests how the conflict between full employment and control of inflation can be dealt with. The reason is that the combinations of inflation and unemployment can be arisen in the short-run as shifts in the aggregate demand curve move the economy along the short-run aggregate supply curve. In the short-run, a rise in aggregate demand for goods and services leads to a greater output of goods and services and a higher price level. In other words, a lower rate of unemployment will be happened by expanding aggregate demand. Therefore, governments and policy makers not only move the economy from point A to point B but also reduce unemployment rate from U1 to U2. However, a higher rate of inflation is also happened (P1?P2). Accordingly, it means there is a trade off between falling unemployment and increasing inflation. Points such as A and B on the Philips Curve offers policy makers a menu of possible outcomes and, consequently, gover nments might decide an acceptable combination between unemployment and inflation. According to Mankiw and Taylor (2006), Friedman and Phelps introduced expected inflation to help understand the short-run and long-run relationship between inflation and unemployment. Expected inflation measures how much people expect the overall price level to change. The graph below introduces the role of expectations into the inflationary process. (adopted from Powell: p.311) In the graph above, we assume unemployment is initially at its natural rate (UN) and price inflation equals wage inflation. When a government pursues an expansionary monetary policy to expand demand, the economy moves along Philips curve SRPC1 (from point A to Point B). At point B, unemployment is below its natural rate, but inflation rises to P1. Consequently, in the short-run, inflation rises above expected inflation and workers may suffer money illusion, the false belief that an increase in money wage is also a real wage increase. However, a point such as B is unsustainable because people get used to this higher inflation rate and they increase their expectations of inflation. Firms and workers, therefore, consider higher inflation when setting wages and prices in order to restore the real wage. The short-run Philips curve, accordingly, shifts to the right (from SRPC1 to SRPC2). Consequently, the economy ends up at point C where there is higher inflation than at point A, but with the same level of unemployment. Powell (2005) says that once the economy reaches at point C, any further expansion of aggregate demand moves the economy to point D and inflation rate of P2. The reason is that this situation will continue if there are higher expected rates of future inflation. Therefore, it gives explanations why unemployment rate regularly decreases then increases and why inflation rate is always positive. Furthermore, it also explains why the changes in inflation rate and unemployment are repeated. Apart from the Philips curve, Keynesian theories of inflation are also helpful to understand the facts which are found. The graph below shows an upward-sloping SRAS curve. (adopted from Powell: p.279) According to Powell (2005), Keynesians now believe the SRAS curve slopes upward and upward-sloping SRAS curve shows that an increase in the price level is necessary to persuade companies to supply more output. It, therefore, explains why unemployment is changed as a result of changes in the rate of inflation. A rise in the price level (from P1 to P2) reduces the real wage rate. Therefore, firms can employ more labour and supply more output and, consequently, unemployment will decrease to increase supply. Moreover, governments can inflate the price level and approach full employment through an increase in aggregate demand. The graph shows an increase in aggregate demand is reflationary or inflationary. It means that expansionary fiscal or monetary policy reflates real output and create jobs, and inflates the price level. Therefore, a rise in aggregate demand moves the economy towards full capacity and, consequently, the economy will be able to approach full employment and full capacity. However, once the economy reaches at full employment, it means there is no spare capacity. Therefore, any further increase in aggregate demand might cause prices to rise and the eventual creation of excess demand will lead to demand-pull inflation. d) Apart from unemployment and the exchange rate, there are more factors influencing changes in the rate of inflation. For example, a monetary and fiscal policy and a prices and incomes policy are available to the governments and policy makers in order to control inflation. Monetary policy and fiscal policy can influence aggregate demand. When the aggregate demand curve or the aggregate supply curve shifts, there are fluctuations in the economys overall output of goods and services and its overall level of prices is also changed. Therefore, a change of these policies can lead to short-run fluctuations in output and prices. A government and policy makers can change interest rates to adjust to balance the supply and demand for money. Furthermore, targeting a certain level of the money supply can be also treated as monetary policy. Therefore, setting interest rates and money supply will be different between in the case of demand-pull inflation and in the case of cost-push inflation. For instance, deflationary monetary policy such as raising interest rates and reducing banking lending might be introduced when demand-pull inflation occurs. However, against cost-push inflation, an expansionary monetary policy such as lowering interest rates might be adopted instead of a restrictionary monetary policy. The rationale behind this is that firms costs can be decreased through an expansionary monetary policy. Consequently, monetary policy can be described either in terms of the money supply or in terms of the interest rate. If monetary policy aims to expand aggregate demand, increasing the money supply or lowering the interest rate is adopted. However, changes in monetary policy that aim to contract aggregate demand can be described either as reducing the money supply or as raising the interest rate. The government is able to affect inflation not only with monetary policy but also with fiscal policy. Mankiw and Taylor (2006: p.721) tells us, Fiscal policy refers to the governments choices regarding the overall level of government purchases or taxes. Through the change of the level of the taxes, a government can indirectly shift the aggregate demand curve by influencing the spending decisions of firms and households. However, contrary to this, the aggregate demand curve can be moved directly when a government changes its own purchases of goods and services. Therefore, fiscal policy might be different in accordance with various causes and different levels of economic activity. Against demand-pull inflation, a government is able to adopt deflationary fiscal policy involving increasing taxation and/or reducing government expenditure. Fiscal policy will indirectly reduce aggregate demand. For example, consumers might lower their spending and firms might reduce investment if a government raises income and corporation tax. By contrast, government expenditure can directly influence aggregate demand. Therefore, deflationary fiscal policy will have a downward multiplier effect and might be able to remove an inflationary gap. The graph below shows that reduced government spending (from G to G1) removes the inflationary gap of AB. (adopted from Grant: p.573) Contrary to the case of demand-pull inflation, different fiscal policy will be also employed to combat cost-push inflation. According to Grant (2000), reducing corporation tax, decreasing indirect tax and cutting income tax are a fiscal approach to cope with cost-push inflation. Through those policies, a government can reduce firms costs or lower wage claims and then will influence aggregate demand. Moreover, monetary inflation will be expected, a government can adopt lowering expenditure by more than tax revenue as its fiscal policy. The discussion of fiscal policy has stressed how changes in government expenditure and changes in taxes influence the quality of goods and services demanded. Fiscal policy works primarily through aggregate demand in the short-run. However, in the long-run, it is also able to affect the quantity of goods and services supplied. Apart from monetary policy and fiscal policy, incomes policies and price controls can also influence changes in inflation. The incomes policy introduced to reduce inflation. Grant (2000) states it is to connect the growth of incomes to the growth of productivity in order to prevent the excessive rises in factor incomes. The incomes policy largely concentrates on wages even though there are many different forms of income such as wages, interest and profits. The rationale behind this is that wages form about two thirds of total costs. Governments are therefore able to control inflation by setting a percentage limit or a flat rate limit. Setting a percentage limit of wages will be useful to maintain wage differentials. Therefore, people in the high-income brackets might be beneficial as a result of a percentage limit. However, the lower brackets of income might be favourable to a flat rate limit because it reduces differentials. Consequently, the incomes policy will be helpful to maintain a wage and price still in the short-run. However, if exceptions are allowed too much or trade unions are strongly opposing the policy, it will be difficult to manage the pace of inflation. Price controls is also employed to restrict price increases. However, contrary to the incomes policy, price controls deals with the symptom of inflation rather than causes. For example, governments limit prices of products to control inflation rate if there is high inflation. Therefore, when inflation will be expected or is already happened governments and policy makers are able to choose price controls to restrict price increases and restore its symptom directly. However, if price controls continues, there will be some problems e.g. distorting the allocation of resources. The reason is that price controls can lead to shortages and create a demand for s system of rationing. In conclusion, governments might try to restrict price increases and to limit pay settlements in order to reduce inflationary pressure. However, introducing the incomes policy and price controls has not only the effectiveness but also problems. Although they are separate policy, those policies can be used together. Furthermore, they might have an effect on the problem of cost-push inflation if they are employed together. Therefore, the incomes policy and price controls will be more effective when those policies are employed together. However, they might be inefficient in the long-run. The reason is that incomes policy and price controls can distort the market economy e.g. creating labour shortages. Bibliography Grant, S.J., 2000, STANLAKES INTRODUCTORY ECONOMICS, Essex, Longman Mankiw, N.G. and Taylor, M.P., 2006, Economics, London, Thomson Learning Marcouse, I., Wall, N., Lines, D. and Martin, B., 2003, Complete A-Z Economics Business Studies, London, Hodder Arnold Powell, R., 2005, AQA advanced Economics, Oxfordshire, Philip Allan Updates Sungsoo Noh